Circulation in Special Regions 1) Pulmonary Circulation Pulmonary artiers (as compared to SYSTEMIC arteries) PULMONARY ARTERIES: Larger _________Thinner wallsDecreased resistance =Decreased amount of _________ required to move blood through the pulmoary circuit. Blood Flow through a particular pulmonary area- O2 level in the areaDecreased O2 level in the alveoli of an area--> ____________ of the vessels to that area. Ara with increased levels of O2 in the alveoli --> __________ of the vessels in that area. (Area with greater O2 is where the blood wants to go. This is what causes the vasodilation due to the increased blood volume.)This is consistent with the role of the lungs i providing O2 to the blood. (more blood will flow through the vesses in efficiently functioning areas of the lungs)

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